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| author | Chen Zheng <czhengsz@cn.ibm.com> | 2021-01-17 23:53:33 -0500 |
|---|---|---|
| committer | Chen Zheng <czhengsz@cn.ibm.com> | 2021-01-24 21:28:21 -0500 |
| commit | 0ed4cf4bf3b65e54d3ccb9a3bf1505efbd1b864c (patch) | |
| tree | f50c800248a0a4f5694eb628a803bf81b8e02548 /llvm/lib/CodeGen/MachineCombiner.cpp | |
| parent | f4537935dcdbf390c863591cf556e76c3abab9c1 (diff) | |
[PowerPC] support register pressure reduction in machine combiner.
Reassociating some patterns to generate more fma instructions to
reduce register pressure.
Reviewed By: jsji
Differential Revision: https://reviews.llvm.org/D92071
Diffstat (limited to 'llvm/lib/CodeGen/MachineCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCombiner.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineCombiner.cpp b/llvm/lib/CodeGen/MachineCombiner.cpp index 878912a6032b..e2b6cfe55c16 100644 --- a/llvm/lib/CodeGen/MachineCombiner.cpp +++ b/llvm/lib/CodeGen/MachineCombiner.cpp @@ -279,6 +279,9 @@ static CombinerObjective getCombinerObjective(MachineCombinerPattern P) { case MachineCombinerPattern::REASSOC_XY_AMM_BMM: case MachineCombinerPattern::REASSOC_XMM_AMM_BMM: return CombinerObjective::MustReduceDepth; + case MachineCombinerPattern::REASSOC_XY_BCA: + case MachineCombinerPattern::REASSOC_XY_BAC: + return CombinerObjective::MustReduceRegisterPressure; default: return CombinerObjective::Default; } |